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Numerical Simulations of snow accumulation in the Bogie Region of a Train Considering snow Particle Rotation

Fluid Dynamics & Materials Processing 2024年第10期20卷 2337-2352页

作者： Hong Lan Jiye Zhang Yao Zhang Lu Cai State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu610031China College of Railway Transportation Hunan University of TechnologyZhuzhou412000China GD Midea Air-Conditioning Equipment Co. Ltd.Foshan528311China

To investigate the influence of snow particle rotational motion on the accumulation of snow in the bogie region of high-speed trains,an Euler‒Lagrange numerical approach is *** study examines the effects of snow particle diameter and train speed on the ensuing *** is shown that considering snow particle rotational motion causes significant deviation in the particle trajectories with respect to non-rotating *** a deviation increases with larger snow particle diameters and higher train *** snow accumulation on the overall surface of the bogie increases,and the amount of snow on the vibration reduction device varies *** certain conditions,the amount of accumulated snow can increase by several orders of magnitudes.

关键词： High-speed train bogie snow particle rotation discrete phase model snow accumulation

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Impacts of snow accumulation on air temperature measured by automatic weather stations on the Antarctic ice sheet

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Chinese Journal of Polar Science 2011年第1期22卷 17-24页

作者： MAYongFeng BIAN LinGen XIAO CunDe Chinese Academy of Meteorological Sciences Beijing 100081 China College of Earth Science Graduate University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Cryospheric Science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

The heights of automatic weather station （AWS） sensors over the Antarctic ice sheet are nominal and change with snow accumulation or ablation. Therefore, the measured data may not be used directly. In this study, we analyzed the impact of snow accumulation on AWS observations using continuous measurements from three AWS that were deployed on the traverse route from the Zhongshan Station to Dome A over East Antarctica. We then corrected the measured air temperature to account for changes in the sensor height relative to the snow surface to improve the authenticity and representativeness of the observation data from the AWS. The results show that （i） the annual mean snow accumulations at Dome A, Eagle and LGB69 were approximately O. 11 m, 0.30 m and 0.49 m, respectively, and the corresponding annual mean air temperature differences between the corrected and measured values at 1 m in height were 0.34℃, 0.29℃ and 0.35℃ （ii） the impact on air temperature from accumulation decreases with height from the surface; （iii） the air temperature difference between the corrected and measured values was not directly proportional to the snow accumulation but was related to the seasonal air temperature variations and the intensity of the local surface inversion; and （iv） the averaged corrected air temperature was higher than the measured values except during the summer when there were days without temperature inversion. The magnitude of the temperature difference between the corrected and measured was mainly determined by snow accumulation and the intensity of the local surface inversion.

关键词： AWS snow accumulation temperature correction

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Surface mass balance and its climate significance from the coast to Dome A, East Antarctica

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Science China Earth Sciences 2015年第10期58卷 1787-1797页

作者： DING MingHu XIAO CunDe LI ChuanJin QIN DaHe JIN Bo SHI GuiTao XIE AiHong CUI XiangBin Institute of Climate System Chinese Academy of Meteorological Sciences State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Chinese Arctic and Antarctic Administration Polar Research Institute of China

Based on stake measurements conducted along the Chinese Antarctic traverse since Jan.1999,we investigated the characteristics of surface mass balance(SMB)and related climate consequences from Zhongshan Station to Dome A,East *** analysis suggests that post-depositional processes have a great impact on surface morphology;thus,the representativeness of a single measurement should be discussed in conjunction with local climate *** comparison among snow accumulation,ice sheet thickness,surface elevation,and ice velocity indicates that the bedrock topography has an indirect connection with the SMB patterns through controlling the surface topography and local *** observation reveals that the Lambert Glacier Basin has been experiencing increasing mass input(4.5%),whereas the inland area has experienced a 6%loss,since *** overall estimation of the SMB along the route is 71.3±44.3 kg m?2 a?1,but the annual and regional variation is *** analysis shows that there are four sections with different SMB patterns as a result of three moisture sources and surface climatic discrepancy in the Antarctic *** study is the first to identify four SMB patterns from the coast to the Dome area and should provide a valuable contribution to modeling and remote sensing on a continental scale.

关键词： surface mass balance ITASE snow accumulation Dome A East Antarctica

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Numerical Investigation of the Deposition Characteristics of snow on the Bogie of a High-Speed Train

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Fluid Dynamics & Materials Processing 2020年第1期16卷 41-53页

作者： Lu Cai Zhen Lou Nan Liu Chao An Jiye Zhang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengduChina CRRC Tangshan Co. Ltd.TangshanChina

To investigate the deposition distribution of snow particles in the bogie surfaces of a high-speed train,a snow particle deposition model,based on the critical capture velocity and the critical shear velocity,was *** based on the unsteady Reynolds-Averaged Navier-Stokes(RANS)approach coupled with Discrete Phase Model(DPM)were used to analyze the motion of snow *** results show that the cross beam of the bogie frame,the anti-snake damper,the intermediate brake clamps in the rear wheels,the traction rod and the anti-rolling torsion bar are prone to accumulate *** accumulation mass relating to the vertical surface in the rear region,horizontal surface in the front region and the corner area of the bogie is *** average snow accumulation mass for each component ordered from high to low is as follow:traction rod,frame,bolster,brake clamp 2,anti-rolling torsion bar,brake clamp 1,transverse damper,axle box 2,axle box 1,air spring,anti-snake damper,tread cleaning *** snow accumulation mass on the front components of the bogie is more significant than that relating to the rear ***,the average snow accumulation mass of rear brake clamp 2 and axle box 2 is about twice as high as that of the front brake clamp 1 and axle box 1.

关键词： High-speed train bogie discrete phase model snow drift snow accumulation

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